Software :: Software Raid Not Showing Increased I/O Throughput On Fedora 12?
Mar 27, 2010
I have implemented level 5 software raid (of 4 partitions on a SINGLE external hard disk). Implementing it on a single hard disk doesn't serve much purpose, I understand, but I did it for demonstration purpose only. The problem is when I read from the raid device into my laptop's hard disk, the time taken to transfer a 900 MB file is about 4 minutes (4 GB RAM) whereas the rime taken to transfer it from a pen drive is 43 seconds. Isn't raid supposed to work faster. However, the write to the raid device is faster than to a pendrive. Shouldn't it be taking data in parallel from the 3 partitions (as even a single disk has multiple heads) ?
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Sep 1, 2010
How do I enable buffered I/O for increased disk throughput on Linux ?
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Jan 6, 2010
I recently installed Fedora 12 for use with Amahi HDA. Before installing on the Hard drive I used the LIVE CD to test it out. While using the LIVE CD I could see all my HDD's. My file system, my 2nd Hard Drive, and my Raid 0 Configuration. (2 250GB drives) and could browse all my files on those drives.
After installing the full version on my hard drive, my RAID drives are showing up as seperate drives. I have a Asus P4P800 board using hte SATA raid. I know its FAKERaid and not a true hardware raid.
My goal is to restore the Raid in Fedora and make those drives active. However, i dont want to lose any of the data on those drives. To make sure I wasn't an idiot, i rebooted withthe LIVE CD again and verified that I could see the Raid Array.
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Feb 21, 2011
I have read many articles on hdparam to calculate the disk read and write speeds and some on interface and CPU limits. But is there a structured way of calculating the maximum throughput of a server including all the subsystems. Like storage, CPU, network, memory and so on? So that I can create a script that i can run on a newly installed Linux machine and calculate the maximum throughput .
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Apr 8, 2010
i have cretaed RAID on one of my server RAID health is ok but its shows warning. so what could be the problem. WARNING: 0:0:RAID-1:2 drives:153GB:Optimal Drives:2 (11528 Errors)
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Dec 21, 2009
I just installed fedora 12 on my system. When I run any command with sudo the following line appears. Mario is not in the sudoers file. This incident will be reported. For the record, I am the administrator of this system. Not unauthorized to run sudo.
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Nov 23, 2010
I installed F13 on a few ACER desktops with 4 GB ram. Recently I tried to upgrade the RAM to 8 GB. But after I plugged in the extra two 2GB ram sticks inside, the system still feels 4 GB. I had double checked with ACER and confirmed that 8 GB is supported by the motherboard. Is there any shortcuts to let the system recognize all the 8GB ram rather than reinstall the whole system.
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Jan 25, 2011
I am using Fedora 11 and when the system booted, the screen resolution and font size were increased all of a sudden. Then I configured the screen resolution using
Quote:
system-config-display
to the actual that I had.
But the fonts in gedit are still big. Although the settings shows the default settings that I search on several blogs i.e.
Quote:
Edit -> Preferences -> Fonts & Colors -> Use the system fixed width font (Monospace 10)
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Aug 28, 2010
I am using Ubuntu 10.04 x64. I am not trying to install Ubuntu on a RAID 1 drive like all of the guides are for. I have a RAID 1 array that I am using for data storage. In windows it shows as a single array just fine. In linux it shows as 2 separate drives. I don't care how they show up to be honest I just have to data written to one drive written to the other automatically as well so my RAID isn't screwed up. Looking through different articles and forums I find a lot of stuff saying that it should show up under /dev/mapper/dxxx or something under /dev/mapper. All that shows up there for me is a device called control which doesn't seem to do something.
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Oct 29, 2010
this is my fdisk -l
Code:
Disk /dev/sdc: 750.1 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders
[code]...
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Dec 17, 2010
I had just configure RAID 1 on my IBM X3400 Server ..Partition information is md0 boot , md1 swap and md2 is root ....but after resyn when i run cat /proc/mdstat I realize that md0 and md1 is ok and present with [UU] status. BUT the md2 is showing on one [U_].. that means my root partition is not properly in RAID 1..
Please suggest how can i make it active in both drive. Or i need to reinstall complete system again. Screen shot attached
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Feb 3, 2011
I have a motherboard with the following chipset Intel 945GM + Intel ICH7R Chipset
This board: http://emea.kontron.com/products/boa...6lcdmmitx.html
I have two 320GB HDDs setup in hardware raid as shown below. But in gparted they are showing as two seperate drives. Why is this?
Raid setup:
GParted
fdisk -l
What am i doing wrong here?
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Mar 11, 2010
I have 4 hard disks. 2 pair of RAID 1 (mirror). Both use the same RAID controller - Intel Marvell.When I boot, this is what is listed in /dev/mapper/:
Code:
crw-rw---- 1 root root 10, 59 2010-03-11 20:58 control
brw------- 1 root root 252, 0 2010-03-11 20:58 isw_bbjfjjdcg_Volume0
[code]...
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Apr 24, 2010
I shall start off by saying that I have just jumped from Windows 7 to Ubuntu and am not regretting the decision one bit. I am however stuck with a problem. I have spent a few hours google'ing this and have read some interesting articles (probably way beyond what the problem actually is) but still don't think I have found the answer.I have installed:
Distributor ID: Ubuntu
Description: Ubuntu lucid (development branch)
Release: 10.04
Codename: lucid
I am running the install on an old Dell 8400. My PC has an Intel RAID Controller built into the MB. I have 1 HDD (without RAID) (which is houses my OS install) and then I have 2 1TB drives (These are just NTFS formatted drives with binary files on them nothing more.) in a RAID 1 (Mirroring) Array. The Intel RAID Controller on Boot recognizes the Array as it always has (irrespective of which OS is installed) however, unlike Windows 7 (where I was able to install the Intel RAID controller driver) .Does anyone know of a resolution (which doesn't involve formatting and / or use of some other software RAID solution) - to get this working which my searches have not taken me too?
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Jul 21, 2010
In my system i have 3 250 GB Hard drives in a RAID 5 configuration. unfortunately, i cannot see this volume in "Computer", so i am unable to access any of the files on the volume. wierd thing is that when i enter disk utility, it finds the drives, and recognises them as a RAID volume. any ideas on how i can access the files on this drive
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Mar 13, 2010
I just expanded my raid 5 array from 3*2TB to 4*2TB and mdadm made the grow successfully and shows an md0 dev with the size of 6TB usable data. Now my problem is that Debian (Lenny) dosnīt show the right amount. See below
######### MDADM DETAILS OF ARRAY ##########
> mdadm --detail /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Mon Dec 14 22:30:46 2009
Raid Level : raid5
[Code].....
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Sep 27, 2010
I have been trying to upgrade my server to Ubuntu 10.04 since it has come out, but I hit a roadblock with my hardware RAID I have two JBODs that work perfectly in Ubuntu 9.10 x64 - but show as seperate, unformatted partitions (one per hdd) in Ubuntu 10.04 x64. Here's the relevant portion of my fstab:
UUID="1fac4a2c-6a2e-4278-bab4-c7179c8720ee" /media/Motherload ext4 exec,auto,async,rw 0 2 #4TB-ext4-/dev/mapper/pdc_cabedbfaef1
UUID="31f1f023-e6a0-4b5e-b9d9-0a46011e7fa0" /media/Fry ext4 exec,auto,async,rw 0 2 #3TB-
[code]....
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Jun 8, 2011
I've been running Debian for a while, and now have the chance to do some enterprise-level experimentation. I stumbled across a very cheap EMC Clariion CX300 fibre RAID unit on eBay with 10 disks (Ģ90!), so I snapped it up with a fibre HBA. It's not a SAN, technically a DAS in its current configuration. I'd like to know how hard it is to set up one of these as an actual disk device in Debian.I tried installing the HBA (an Agilent Tachyon XL2 PCI-X card, 32 and 64-bit modes) in my current 'live' server (a Celeron 1.2GHz-based machine), but while Debian detected it as a FC controller card, mapping the LUNs within Navisphere on the CX to the host caused nothing (obvious) to show up in the OS. From what I've read about setting up SANs (not DASs, there seems to be precious little info on setting up these), there's firmware involved with the card, and there are no references to getting a Tachyon running under Linux.
I also snagged a good deal on a PowerEdge 1850 server, but as it's the PCI-Express version, the Tachyon won't fit, so I'm considering buying a PCI-E HBA. I found a QLogic QLE2460 for a good price, but I'm hesitant to buy it, in case I still can't get Debian to see the disks. I'd most like to have the device connected to the PowerEdge instead of the Celeron machine. Have I missed a step in the configuration, or is there anything I can do to test if the system is working as it should be? The units we use at work are much simpler: set the RAIDs up, map the host LUNs and the disk shows up in Windows. I'm also sure I've set everything up correctly on the CX, as the same LUN is available to Windows. Just need to get Debian to see something on the end of the HBA!System Specs:Live Server: Celeron 1.2GHz, 512MB RAM, Intel D815EEA2 board, SATA soft-RAID hard drives, PCI Gb Ethernet and USB2.0, Agilent Tachyon XL2 PCI-X FC HBA, Debian 6.0.1PowerEdge 1850: 2x 3.2GHz Xeons, 6GB RAM, SCSI RAID disks, PCI-E riser, planned QLogic QLE2460 PCI-E HBARAID Unit: EMC Clariion CX300, 10x 146GB FC disks, 2Gbps Fibre-channel interfaceThe PowerEdge is the planned replacement for the Celeron machine, which started life as my experimentation box and became my personal live server. Storage is holding it back, so I'd love to add a further five disks to the CX and have nearly 2TB of RAID-protected storage.
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Jun 24, 2009
I've tried to install Fedora 11, both 32 and 64 on my main machine.It could not install as it stops on the first install window. I've already filed a bug but really haven't seen any feed back yet.The bug has something to do with Anaconda and the Raid array but I really can't tell.
I have an Intel Board (see signature). I am running intel raid software under W7 currently.It works fine. But, I'm wondering, when I attempt to install F!!, is my current raid set-up causing problems? Do I need to get rid of the intel raid software and use a Fedor/Linux raid program to manage the raid array??
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Aug 7, 2011
Having one issue with evolution not showing html websites showing up in email like verizon sending a promo. I have gone to edit, preferences, mail preferences, html messages and have always load images from the internet chosen. I have also added sender to contacts. Even if I right click message and tell it to dload images it doesn't.
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Aug 4, 2011
i want to know the throughput of my pc after i enable RFS and RPS configuration. how to calculate tps or how to see throughput ......
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Apr 15, 2011
My objective is when the throughput is increase my shell script is Print a message. But the Question is how to check the bandwidth.
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May 15, 2010
I want to know the actual maximum throughput of my lan at home.Could you suggest some free monitoring tools for me to use
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Feb 1, 2011
Could any RAID gurus kindly assist me on the following RAID-5 issue?I have an mdadm-created RAID5 array consisting of 4 discs. One of the discs was dropping out, so I decided to replace it. Somehow, this went terribly wrong and I succeeded in marking two of the drives as faulty, and the re-adding them as spare.
Now the array is (logically) no longer able to start:
mdadm: Not enough devices to start the array.Degraded and can't create RAID ,auto stop RAID [md1]
I was able to examine the disks though:
Code:
root@127.0.0.1:/etc# mdadm --examine /dev/sdb2
/dev/sdb2:
Magic : a92b4efc
Version : 00.90.00
code....
Code:
mdadm --create --assume-clean --level=5 --raid-devices=4 /dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sdd2
As I don't want to ruin the maybe small chance I have left to rescue my data, I would like to hear the input of this wise community.
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Feb 18, 2011
I have increased my RAM from 2 MB to 4MB, Vista can see most of it(it can't see more because it is 32 bits)but when I run Virtual box I can only see up to 2MB of memory.Is there anything I can do to fix this?
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Nov 14, 2010
Lets assume we have a 100mbps connection between two servers in same switch. then How much is the total throughput of the connection between servers. For example if I am downloading with 70mbps from other server , do I still have 100mbps upload BW available ? or 30mbps is available ? in other words for a 100mbps connection , the limit of download+upload is 100mbps ? or we have 100mbps download and 100mbps upload available ?
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May 30, 2011
I have pc with two NIC's (eht0 and eth1). I want to test throughput switch/router.I can ping on both interfaces.Connection Diagram:
eth0 -> Patchcord -> testing devices -> Patchcord -> eth1
I run two iperf:
-s -B 192.168.1.10 (eth0)
-c 192.168.1.20 -B 192.168.1.20 (eth1)
Results:
[ 3] 0.0-10.0 sec 4.45 GBytes 3.82 Gbits/sec
The test results are false because I use 100Mb/s NIC's. I can't use two pc's for test.I tried to do the same test under windows 7 x64 it and works properly, but under windows xp there occurs the same problem like under ubuntu.
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Jul 7, 2011
I accepted the latest Natty update about which I was notified a couple of days ago (I don't remember exactly). I don't remember a new kernel being pushed out, but for the record I'm on 2.6.38-8-generic right now. I'm trying to interact with a USB compact flash reader and I'm getting ridiculously low throughput (less than 1 MB per second). Before this latest upgrade, I don't remember this being a problem.
Better yet, does anybody know what might be wrong and what I might be able to do to fix this?
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Jun 16, 2010
Having finally got Samba shares and printer shares working on my Lucid Lynx server, I've noticed that the throughput from/to those shares is very slow to what I was used to when I had those shares on a W2K server.Having Googled this problem, I noted that there was a known issue with this in Karmic (believe Brian Wu was looking at it). However, I don't see any results in Google as to this being a problem in Lucid.
I know ipv6 can cause a problem in this regard but having issued the command:
lsmod | grep inet6
I know that ipv6 is indeed disabled on my Lucid server. Any further information on whether the error reported in Karmic still applies in Lucid, and can this be addressed in any way?
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Jan 18, 2011
I have an enormous quadcore machine with 16gb ram and dual gigabit NICs. It used to be for MySQL but we have upgraded the whole database infrastructure so now this server is left floating. I had the great idea of turning this into a reverse-proxy (using apache mod_proxy) and it really handles a ton of requests. But I have a feeling that we are not getting the most use out of what it can offer.
Our traffic consists of a few thousand very small (less than 10 byte) ajax calls per second, and frequently I find we are running out of kernel allocated network stack to handle all the requests. Often we get the kern.log warning "possible SYN flooding on port 80. Sending cookies." and other things like this. Obviously we are not getting SYN flooded, we just have very high demand.
So far I have found a few kernel tuning guides to tell the kernel to allocate more of the base system memory for networking but every guide I have found has been for the purpose of increasing the performance between WAN links (direct backbones between offices etc) and usually with very large file sizes being the priority. One such example (and great) write up is here:
cyberciti.biz/faq/linux-tcp-tuning/
I was hoping some people could provide further input, such as along the lines of disabling nf_conntrack (to speed up socket set up/tear down time) or anything that will speed up a high throughput proxy like mine. Any links to studies or benchmarks between different configurations or hardware gets extra points!
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